CBSE 8th Standard Science Coal and Petroleum Sample Question Papers Study Material - QB365 Set C | QB365

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Published on: 29/10/2025

Question Set C

CBSE 8th Standard Science Coal and Petroleum Sample Question Papers Study Material - QB365

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Std: 8th Standard CBSE - Science

chapter: Coal and Petroleum - Sample Question Papers

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Questions:

True or False

7 x 1 = 7

Resources which are present in unlimited quantity in nature are called exhaustible natural resources.

(a)

True

(b)

False

Oxygen in air is an exhaustible natural resource

(a)

True

(b)

False

Kerosene is not a fossil fuel.

(a)

True

(b)

False

Coal tar is a mixture of various substances.

(a)

True

(b)

False

Coke is almost pure form of carbon

(a)

True

(b)

False

CNG is more polluting fuel than petrol.

(a)

True

(b)

False

Fossil fuels can be made in the laboratory.

(a)

True

(b)

False

Generic 2

4 x 2 = 8

How can you define coke?

Petrochemicals are obtained from where? Give examples

10.

Petroleum is called black gold. Why?

11.

Where was the first oil well drilled in India?

Generic 3

4 x 3 = 12

12.

Nikita visited a thermal power plant. She was surprised to see the use of tonnes of coal per day to generate electricity. She was highly disturbed when she thought of all the coal getting exhausted in one day. She decided from that day to use only required amount of electricity without any wastage and spread the message across.
Read the given passage and answer the following questions
(a) What role does coal play in a thermal power plant?
(b) What values are possessed by Nikita?

13.

Write the name of the products obtained when coal is heated strongly in the absence of air. Write the name of this process also.

14.

You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two?

15.

What are the disadvantages of using fossil fuels?

Generic 5

2 x 5 = 10

16.

The substance A is a fossil fuel. It occurs deep below the earth's crust in certain areas. Another fossil fuel B is found above the substance A. When A is subjected to a process C, a number of different products (fractions) are collected at different temperature ranges which have different uses. A special grade of product D obtained in this process is used as aviation fuel in jet aeroplanes. The product D is also used in stoves, lamps, etc
Now give the answer of the following questions.
(a) What are the substances, A and B?
(b) Write the physical states of substances A and B.
(c) What is the process C called?
(d) Name the product D.

17.

We read in newspapers that burning of fuels is a major cause of global warming. Explain why?

Multiple Choice Question

6 x 1 = 6

18.

Naphthalene balls are obtained from coal tar and are used as

(a)

mosquito repellant

(b)

moth repellant

(c)

snake repellant

19.

Which substance is formed by the carbonisation of dead vegetation?

(a)

Coal

(b)

Coke

(c)

Coal gas

(d)

Coal tar

20.

Coal is formed from the remains of

(a)

vegetation only

(b)

animals only

(c)

both vegetation and animals

(d)

neither vegetation nor animals

21.

Which of the following is a pair of exhaustible natural resources?

(a)

Coal and soil

(b)

Air and sunlight

(c)

Water and petroleum

(d)

Wildlife and minerals

22.

Air is a natural resource and cannot be exhausted by human activities. It is known as inexhaustible natural resource. Which of the following is another inexhaustible natural resource?

(a)

Coal

(b)

Petroleum

(c)

Sunlight

(d)

Minerals

23.

Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?

(a)

Minerals

(b)

Water

(c)

Soil

(d)

Plastic

Fill up / 1 Marks

7 x 1 = 7

24.

The substances formed from natural gas and petroleum are called_____________

25.

Petroleum is very important so, it is called______________________

26.

Sunlight is an ______________natural resource.

27.

_______________is used in vaseline

28.

Forests and coal are ___________________natural resources

29.

Petroleum,_____________________ and ______________________are fossil fuels.

30.

Coal tar is a black, thick_____________ with an _______________smell.

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Answers Key:

True or False

7 x 1 = 7

(b)
False

(b)
False

(b)
False

(a)
True

(a)
True

(b)
False

(b)
False

Generic 2

4 x 2 = 8

Coke is tough, porous and black substance. It is almost pure form of carbon.

Those chemicals which are obtained from petroleum and natural gas are called petrochemicals. Some examples of petrochemicals are methyl alcohol, ethyl alcohol, acetone, benzene, hydrogen, etc.

10.

Petroleum is called black gold due to its great commercial importance.

11.

It was drilled in Makum in Assam.

Generic 3

4 x 3 = 12

12.

(a) Coal is burnt to heat water and convert it to steam, which then runs the turbines for the generators.
(b) Nikita is environment concerned, conscious of energy usage and tries to think beyond the visible.

13.

When coal is heated strongly in the absence of air in closed retorts, various useful products are obtained. These are coke, coal tar and coal gas. The strong heating of coal in the absence of air is called destructive distillation of coal.

14.

Decantation can be used to separate a mixture of petroleum and water. The mixture is allowed to stand. Carefully, lighter layer can be poured and separated without disturbing the heavier one.

15.

Disadvantages of using fossil fuels are
(i) It causes air pollution.
(ii) It causes global warming because they produce greenhouse gas, i.e. carbon dioxide on burning
(iii) The by-products of burning fuels cause acid rain which pollute water resources

Generic 5

2 x 5 = 10

16.

(a) A is petroleum and B is natural gas.
(b) A is thick liquid while B is gas.
(c) C is called fractional distillation
(d) D is kerosene.

17.

Burning of fuels is a major cause of global warming because they produce a lot of greenhouse gas 'carbon dioxide' on burning.
The earth's atmosphere allows most of the sunlight that falls on it to pass through and heat the surface. But greenhouse gases such as carbon dioxide, methane, water vapours trap the heat radiated from earth. This leads to an increase in earth's temperature. This is known as greenhouse effect.
When concentration of greenhouse gases such as carbon dioxide increases, greenhouse effect also increases. This is known as global warming. It may cause melting of ice caps and glaciers resulting the rise in sea levels.

Multiple Choice Question

6 x 1 = 6

18.